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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Putrescine Transport in a Cyanobacterium Synechocystis sp. PCC 6803

  • Raksajit, Wuttinun (Department of Biochemistry, Faculty of Science, Chulalongkorn University) ;
  • Maenpaa, Pirkko (Laboratory of Plant Physiology and Molecular Biology, Department of Biology, University of Turku) ;
  • Incharoensakdi, Aran (Department of Biochemistry, Faculty of Science, Chulalongkorn University)
  • Received : 2006.02.08
  • Accepted : 2006.04.03
  • Published : 2006.07.31
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Abstract

The transport of putrescine into a moderately salt tolerant cyanobacterium Synechocystis sp. PCC 6803 was characterized by measuring the uptake of radioactively-labeled putrescine. Putrescine transport showed saturation kinetics with an apparent $K_m$ of $92{\pm}10\;{\mu}M$ and $V_{max}$ of $0.33{\pm}0.05\;nmol/min/mg$ protein. The transport of putrescine was pH-dependent with highest activity at pH 7.0. Strong inhibition of putrescine transport was caused by spermine and spermidine whereas only slight inhibition was observed by the addition of various amino acids. These results suggest that the transport system in Synechocystis sp. PCC 6803 is highly specific for polyamines. Putrescine transport is energy-dependent as evidenced by the inhibition by various metabolic inhibitors and ionophores. Slow growth was observed in cells grown under salt stress. Addition of low concentration of putrescine could restore growth almost to the level observed in the absence of salt stress. Upshift of the external osmolality generated by either NaCl or sorbitol caused an increased putrescine transport with an optimum 2-fold increase at 20 mosmol/kg. The stimulation of putrescine transport mediated by osmotic upshift was abolished in chloramphenicol-treated cells, suggesting possible involvement of an inducible transport system.

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References

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